Open AccessAn Inverter Parallel Control Strategy Research on Variable Virtual Impedance
Author(s) -
Weibo Li,
Zhihao Xu,
Cong Xu,
Wei Li,
Qi Li
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/486/1/012009
Subject(s) - ac power , inverter , voltage droop , control theory (sociology) , volt ampere reactive , computer science , electrical impedance , power (physics) , grid tie inverter , output impedance , voltage , engineering , electronic engineering , maximum power point tracking , control (management) , voltage optimisation , voltage source , electrical engineering , physics , quantum mechanics , artificial intelligence
In order to solve the imbalance distribution of reactive power in the power system caused by different line impedance in parallel muti-inverter system, This paper analyses the deficiency of traditional droop control and the causes of reactive current circulation. Double closed loop control based on inverter voltage and current, it studies the influence of different system parameters on the equivalent impedance of the inverter, according to the study it introduce virtual impedance, the real-time reactive power is distributed to a given reactive power through the inverter’s control system, and then the inverter control system estimates the virtual impedance by deviating the reactive power from the given reactive power. Simulation results show that the method of adjust reactive power on line have certain effectiveness and feasibility.